// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information. using System.Collections; using System.Collections.Generic; using System.Data.Linq; using System.Data.Objects.DataClasses; using System.IO; using System.Web.UI.WebControls; using Microsoft.Web.UnitTestUtil; using Moq; using Xunit; using Assert = Microsoft.TestCommon.AssertEx; namespace System.Web.Mvc.Html.Test { public class DefaultEditorTemplatesTest { // BooleanTemplate [Fact] public void BooleanTemplateTests() { // Boolean values Assert.Equal( @"", DefaultEditorTemplates.BooleanTemplate(MakeHtmlHelper(true))); Assert.Equal( @"", DefaultEditorTemplates.BooleanTemplate(MakeHtmlHelper(false))); Assert.Equal( @"", DefaultEditorTemplates.BooleanTemplate(MakeHtmlHelper(null))); // Nullable values Assert.Equal( @"", DefaultEditorTemplates.BooleanTemplate(MakeHtmlHelper>(true))); Assert.Equal( @"", DefaultEditorTemplates.BooleanTemplate(MakeHtmlHelper>(false))); Assert.Equal( @"", DefaultEditorTemplates.BooleanTemplate(MakeHtmlHelper>(null))); } // CollectionTemplate private static string CollectionSpyCallback(HtmlHelper html, ModelMetadata metadata, string htmlFieldName, string templateName, DataBoundControlMode mode, object additionalViewData) { return String.Format(Environment.NewLine + "Model = {0}, ModelType = {1}, PropertyName = {2}, HtmlFieldName = {3}, TemplateName = {4}, Mode = {5}, TemplateInfo.HtmlFieldPrefix = {6}, AdditionalViewData = {7}", metadata.Model ?? "(null)", metadata.ModelType == null ? "(null)" : metadata.ModelType.FullName, metadata.PropertyName ?? "(null)", htmlFieldName == String.Empty ? "(empty)" : htmlFieldName ?? "(null)", templateName ?? "(null)", mode, html.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix, AnonymousObject.Inspect(additionalViewData)); } [Fact] public void CollectionTemplateWithNullModel() { // Arrange HtmlHelper html = MakeHtmlHelper(null); // Act string result = DefaultEditorTemplates.CollectionTemplate(html, CollectionSpyCallback); // Assert Assert.Equal(String.Empty, result); } [Fact] public void CollectionTemplateNonEnumerableModelThrows() { // Arrange HtmlHelper html = MakeHtmlHelper(new object()); // Act & Assert Assert.Throws( () => DefaultEditorTemplates.CollectionTemplate(html, CollectionSpyCallback), "The Collection template was used with an object of type 'System.Object', which does not implement System.IEnumerable." ); } [Fact] public void CollectionTemplateWithSingleItemCollectionWithoutPrefix() { // Arrange HtmlHelper html = MakeHtmlHelper>(new List { "foo" }); html.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix = null; // Act string result = DefaultEditorTemplates.CollectionTemplate(html, CollectionSpyCallback); // Assert Assert.Equal(@" Model = foo, ModelType = System.String, PropertyName = (null), HtmlFieldName = [0], TemplateName = (null), Mode = Edit, TemplateInfo.HtmlFieldPrefix = , AdditionalViewData = (null)", result); } [Fact] public void CollectionTemplateWithSingleItemCollectionWithPrefix() { // Arrange HtmlHelper html = MakeHtmlHelper>(new List { "foo" }); html.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix = "ModelProperty"; // Act string result = DefaultEditorTemplates.CollectionTemplate(html, CollectionSpyCallback); // Assert Assert.Equal(@" Model = foo, ModelType = System.String, PropertyName = (null), HtmlFieldName = ModelProperty[0], TemplateName = (null), Mode = Edit, TemplateInfo.HtmlFieldPrefix = , AdditionalViewData = (null)", result); } [Fact] public void CollectionTemplateWithMultiItemCollection() { // Arrange HtmlHelper html = MakeHtmlHelper>(new List { "foo", "bar", "baz" }); html.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix = null; // Act string result = DefaultEditorTemplates.CollectionTemplate(html, CollectionSpyCallback); // Assert Assert.Equal(@" Model = foo, ModelType = System.String, PropertyName = (null), HtmlFieldName = [0], TemplateName = (null), Mode = Edit, TemplateInfo.HtmlFieldPrefix = , AdditionalViewData = (null) Model = bar, ModelType = System.String, PropertyName = (null), HtmlFieldName = [1], TemplateName = (null), Mode = Edit, TemplateInfo.HtmlFieldPrefix = , AdditionalViewData = (null) Model = baz, ModelType = System.String, PropertyName = (null), HtmlFieldName = [2], TemplateName = (null), Mode = Edit, TemplateInfo.HtmlFieldPrefix = , AdditionalViewData = (null)", result); } [Fact] public void CollectionTemplateNullITemInWeaklyTypedCollectionUsesModelTypeOfString() { // Arrange HtmlHelper html = MakeHtmlHelper(new ArrayList { null }); html.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix = null; // Act string result = DefaultEditorTemplates.CollectionTemplate(html, CollectionSpyCallback); // Assert Assert.Equal(@" Model = (null), ModelType = System.String, PropertyName = (null), HtmlFieldName = [0], TemplateName = (null), Mode = Edit, TemplateInfo.HtmlFieldPrefix = , AdditionalViewData = (null)", result); } [Fact] public void CollectionTemplateNullItemInStronglyTypedCollectionUsesModelTypeFromIEnumerable() { // Arrange HtmlHelper html = MakeHtmlHelper>(new List { null }); html.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix = null; // Act string result = DefaultEditorTemplates.CollectionTemplate(html, CollectionSpyCallback); // Assert Assert.Equal(@" Model = (null), ModelType = System.Web.IHttpHandler, PropertyName = (null), HtmlFieldName = [0], TemplateName = (null), Mode = Edit, TemplateInfo.HtmlFieldPrefix = , AdditionalViewData = (null)", result); } [Fact] public void CollectionTemplateUsesRealObjectTypes() { // Arrange HtmlHelper html = MakeHtmlHelper>(new List { 1, 2.3, "Hello World" }); html.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix = null; // Act string result = DefaultEditorTemplates.CollectionTemplate(html, CollectionSpyCallback); // Assert Assert.Equal(@" Model = 1, ModelType = System.Int32, PropertyName = (null), HtmlFieldName = [0], TemplateName = (null), Mode = Edit, TemplateInfo.HtmlFieldPrefix = , AdditionalViewData = (null) Model = 2.3, ModelType = System.Double, PropertyName = (null), HtmlFieldName = [1], TemplateName = (null), Mode = Edit, TemplateInfo.HtmlFieldPrefix = , AdditionalViewData = (null) Model = Hello World, ModelType = System.String, PropertyName = (null), HtmlFieldName = [2], TemplateName = (null), Mode = Edit, TemplateInfo.HtmlFieldPrefix = , AdditionalViewData = (null)", result); } [Fact] public void CollectionTemplateNullItemInCollectionOfNullableValueTypesDoesNotDiscardNullable() { // Arrange HtmlHelper html = MakeHtmlHelper>(new List { 1, null, 2 }); html.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix = null; // Act string result = DefaultEditorTemplates.CollectionTemplate(html, CollectionSpyCallback); // Assert Assert.Equal(@" Model = 1, ModelType = System.Nullable`1[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], PropertyName = (null), HtmlFieldName = [0], TemplateName = (null), Mode = Edit, TemplateInfo.HtmlFieldPrefix = , AdditionalViewData = (null) Model = (null), ModelType = System.Nullable`1[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], PropertyName = (null), HtmlFieldName = [1], TemplateName = (null), Mode = Edit, TemplateInfo.HtmlFieldPrefix = , AdditionalViewData = (null) Model = 2, ModelType = System.Nullable`1[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], PropertyName = (null), HtmlFieldName = [2], TemplateName = (null), Mode = Edit, TemplateInfo.HtmlFieldPrefix = , AdditionalViewData = (null)", result); } // DecimalTemplate [Fact] public void DecimalTemplateTests() { Assert.Equal( @"", DefaultEditorTemplates.DecimalTemplate(MakeHtmlHelper(12.3456M))); Assert.Equal( @"", DefaultEditorTemplates.DecimalTemplate(MakeHtmlHelper(12.3456M, "Formatted Value"))); Assert.Equal( @"alert('XSS!')</script>"" />", DefaultEditorTemplates.DecimalTemplate(MakeHtmlHelper(12.3456M, ""))); } // HiddenInputTemplate [Fact] public void HiddenInputTemplateTests() { Assert.Equal( @"Hidden Value", DefaultEditorTemplates.HiddenInputTemplate(MakeHtmlHelper("Hidden Value"))); Assert.Equal( @"<script>alert('XSS!')</script>alert('XSS!')</script>"" />", DefaultEditorTemplates.HiddenInputTemplate(MakeHtmlHelper(""))); var helperWithInvisibleHtml = MakeHtmlHelper("", "Encode me!"); helperWithInvisibleHtml.ViewData.ModelMetadata.HideSurroundingHtml = true; Assert.Equal( @"alert('XSS!')</script>"" />", DefaultEditorTemplates.HiddenInputTemplate(helperWithInvisibleHtml)); byte[] byteValues = { 1, 2, 3, 4, 5 }; Assert.Equal( @""AQIDBAU="", DefaultEditorTemplates.HiddenInputTemplate(MakeHtmlHelper(new Binary(byteValues)))); Assert.Equal( @"System.Byte[]", DefaultEditorTemplates.HiddenInputTemplate(MakeHtmlHelper(byteValues))); } // MultilineText [Fact] public void MultilineTextTemplateTests() { Assert.Equal( @"", DefaultEditorTemplates.MultilineTextTemplate(MakeHtmlHelper("", @"Multiple Line Value!"))); Assert.Equal( @"", DefaultEditorTemplates.MultilineTextTemplate(MakeHtmlHelper("", ""))); } // ObjectTemplate private static string SpyCallback(HtmlHelper html, ModelMetadata metadata, string htmlFieldName, string templateName, DataBoundControlMode mode, object additionalViewData) { return String.Format("Model = {0}, ModelType = {1}, PropertyName = {2}, HtmlFieldName = {3}, TemplateName = {4}, Mode = {5}, AdditionalViewData = {6}", metadata.Model ?? "(null)", metadata.ModelType == null ? "(null)" : metadata.ModelType.FullName, metadata.PropertyName ?? "(null)", htmlFieldName == String.Empty ? "(empty)" : htmlFieldName ?? "(null)", templateName ?? "(null)", mode, AnonymousObject.Inspect(additionalViewData)); } class ObjectTemplateModel { public ObjectTemplateModel() { ComplexInnerModel = new object(); } public string Property1 { get; set; } public string Property2 { get; set; } public object ComplexInnerModel { get; set; } } [Fact] public void ObjectTemplateEditsSimplePropertiesOnObjectByDefault() { string expected = @"
Model = p1, ModelType = System.String, PropertyName = Property1, HtmlFieldName = Property1, TemplateName = (null), Mode = Edit, AdditionalViewData = (null)
Model = (null), ModelType = System.String, PropertyName = Property2, HtmlFieldName = Property2, TemplateName = (null), Mode = Edit, AdditionalViewData = (null)
"; // Arrange ObjectTemplateModel model = new ObjectTemplateModel { Property1 = "p1", Property2 = null }; HtmlHelper html = MakeHtmlHelper(model); // Act string result = DefaultEditorTemplates.ObjectTemplate(html, SpyCallback); // Assert Assert.Equal(expected, result); } [Fact] public void ObjectTemplateWithModelError() { string expected = @"
Model = p1, ModelType = System.String, PropertyName = Property1, HtmlFieldName = Property1, TemplateName = (null), Mode = Edit, AdditionalViewData = (null) Error Message
Model = (null), ModelType = System.String, PropertyName = Property2, HtmlFieldName = Property2, TemplateName = (null), Mode = Edit, AdditionalViewData = (null)
"; // Arrange ObjectTemplateModel model = new ObjectTemplateModel { Property1 = "p1", Property2 = null }; HtmlHelper html = MakeHtmlHelper(model); html.ViewData.ModelState.AddModelError("FieldPrefix.Property1", "Error Message"); // Act string result = DefaultEditorTemplates.ObjectTemplate(html, SpyCallback); // Assert Assert.Equal(expected, result); } [Fact] public void ObjectTemplateWithDisplayNameMetadata() { string expected = @"
Model = (null), ModelType = System.String, PropertyName = Property1, HtmlFieldName = Property1, TemplateName = (null), Mode = Edit, AdditionalViewData = (null)
Model = (null), ModelType = System.String, PropertyName = Property2, HtmlFieldName = Property2, TemplateName = (null), Mode = Edit, AdditionalViewData = (null)
"; // Arrange ObjectTemplateModel model = new ObjectTemplateModel(); HtmlHelper html = MakeHtmlHelper(model); Mock provider = new Mock(); Func accessor = () => model; Mock metadata = new Mock(provider.Object, null, accessor, typeof(ObjectTemplateModel), null); ModelMetadata prop1Metadata = new ModelMetadata(provider.Object, typeof(ObjectTemplateModel), null, typeof(string), "Property1") { DisplayName = String.Empty }; ModelMetadata prop2Metadata = new ModelMetadata(provider.Object, typeof(ObjectTemplateModel), null, typeof(string), "Property2") { DisplayName = "Custom display name" }; html.ViewData.ModelMetadata = metadata.Object; metadata.Setup(p => p.Properties).Returns(() => new[] { prop1Metadata, prop2Metadata }); // Act string result = DefaultEditorTemplates.ObjectTemplate(html, SpyCallback); // Assert Assert.Equal(expected, result); } [Fact] public void ObjectTemplateWithShowForEditorMetadata() { string expected = @"
Model = (null), ModelType = System.String, PropertyName = Property1, HtmlFieldName = Property1, TemplateName = (null), Mode = Edit, AdditionalViewData = (null)
"; // Arrange ObjectTemplateModel model = new ObjectTemplateModel(); HtmlHelper html = MakeHtmlHelper(model); Mock provider = new Mock(); Func accessor = () => model; Mock metadata = new Mock(provider.Object, null, accessor, typeof(ObjectTemplateModel), null); ModelMetadata prop1Metadata = new ModelMetadata(provider.Object, typeof(ObjectTemplateModel), null, typeof(string), "Property1") { ShowForEdit = true }; ModelMetadata prop2Metadata = new ModelMetadata(provider.Object, typeof(ObjectTemplateModel), null, typeof(string), "Property2") { ShowForEdit = false }; html.ViewData.ModelMetadata = metadata.Object; metadata.Setup(p => p.Properties).Returns(() => new[] { prop1Metadata, prop2Metadata }); // Act string result = DefaultEditorTemplates.ObjectTemplate(html, SpyCallback); // Assert Assert.Equal(expected, result); } [Fact] public void ObjectTemplatePreventsRecursionOnModelValue() { string expected = @"
Model = propValue2, ModelType = System.String, PropertyName = Property2, HtmlFieldName = Property2, TemplateName = (null), Mode = Edit, AdditionalViewData = (null)
"; // Arrange ObjectTemplateModel model = new ObjectTemplateModel(); HtmlHelper html = MakeHtmlHelper(model); Mock provider = new Mock(); Func accessor = () => model; Mock metadata = new Mock(provider.Object, null, accessor, typeof(ObjectTemplateModel), null); ModelMetadata prop1Metadata = new ModelMetadata(provider.Object, typeof(ObjectTemplateModel), () => "propValue1", typeof(string), "Property1"); ModelMetadata prop2Metadata = new ModelMetadata(provider.Object, typeof(ObjectTemplateModel), () => "propValue2", typeof(string), "Property2"); html.ViewData.ModelMetadata = metadata.Object; metadata.Setup(p => p.Properties).Returns(() => new[] { prop1Metadata, prop2Metadata }); html.ViewData.TemplateInfo.VisitedObjects.Add("propValue1"); // Act string result = DefaultEditorTemplates.ObjectTemplate(html, SpyCallback); // Assert Assert.Equal(expected, result); } [Fact] public void ObjectTemplatePreventsRecursionOnModelTypeForNullModelValues() { string expected = @"
Model = propValue2, ModelType = System.String, PropertyName = Property2, HtmlFieldName = Property2, TemplateName = (null), Mode = Edit, AdditionalViewData = (null)
"; // Arrange ObjectTemplateModel model = new ObjectTemplateModel(); HtmlHelper html = MakeHtmlHelper(model); Mock provider = new Mock(); Func accessor = () => model; Mock metadata = new Mock(provider.Object, null, accessor, typeof(ObjectTemplateModel), null); ModelMetadata prop1Metadata = new ModelMetadata(provider.Object, typeof(ObjectTemplateModel), null, typeof(string), "Property1"); ModelMetadata prop2Metadata = new ModelMetadata(provider.Object, typeof(ObjectTemplateModel), () => "propValue2", typeof(string), "Property2"); html.ViewData.ModelMetadata = metadata.Object; metadata.Setup(p => p.Properties).Returns(() => new[] { prop1Metadata, prop2Metadata }); html.ViewData.TemplateInfo.VisitedObjects.Add(typeof(string)); // Act string result = DefaultEditorTemplates.ObjectTemplate(html, SpyCallback); // Assert Assert.Equal(expected, result); } [Fact] public void ObjectTemplateDisplaysNullDisplayTextWithNullModelAndTemplateDepthGreaterThanOne() { // Arrange HtmlHelper html = MakeHtmlHelper(null); ModelMetadata metadata = ModelMetadataProviders.Current.GetMetadataForType(null, typeof(ObjectTemplateModel)); metadata.NullDisplayText = "Null Display Text"; metadata.SimpleDisplayText = "Simple Display Text"; html.ViewData.ModelMetadata = metadata; html.ViewData.TemplateInfo.VisitedObjects.Add("foo"); html.ViewData.TemplateInfo.VisitedObjects.Add("bar"); // Act string result = DefaultEditorTemplates.ObjectTemplate(html, SpyCallback); // Assert Assert.Equal(metadata.NullDisplayText, result); } [Fact] public void ObjectTemplateDisplaysSimpleDisplayTextWithNonNullModelTemplateDepthGreaterThanOne() { // Arrange ObjectTemplateModel model = new ObjectTemplateModel(); HtmlHelper html = MakeHtmlHelper(model); ModelMetadata metadata = ModelMetadataProviders.Current.GetMetadataForType(() => model, typeof(ObjectTemplateModel)); html.ViewData.ModelMetadata = metadata; metadata.NullDisplayText = "Null Display Text"; metadata.SimpleDisplayText = "Simple Display Text"; html.ViewData.TemplateInfo.VisitedObjects.Add("foo"); html.ViewData.TemplateInfo.VisitedObjects.Add("bar"); // Act string result = DefaultEditorTemplates.ObjectTemplate(html, SpyCallback); // Assert Assert.Equal(metadata.SimpleDisplayText, result); } // PasswordTemplate [Fact] public void PasswordTemplateTests() { Assert.Equal( @"", DefaultEditorTemplates.PasswordTemplate(MakeHtmlHelper("Value"))); Assert.Equal( @"alert('XSS!')</script>"" />", DefaultEditorTemplates.PasswordTemplate(MakeHtmlHelper(""))); } [Fact] public void ObjectTemplateWithHiddenHtml() { string expected = @"Model = propValue1, ModelType = System.String, PropertyName = Property1, HtmlFieldName = Property1, TemplateName = (null), Mode = Edit, AdditionalViewData = (null)"; // Arrange ObjectTemplateModel model = new ObjectTemplateModel(); HtmlHelper html = MakeHtmlHelper(model); Mock provider = new Mock(); Func accessor = () => model; Mock metadata = new Mock(provider.Object, null, accessor, typeof(ObjectTemplateModel), null); ModelMetadata prop1Metadata = new ModelMetadata(provider.Object, typeof(ObjectTemplateModel), () => "propValue1", typeof(string), "Property1") { HideSurroundingHtml = true }; html.ViewData.ModelMetadata = metadata.Object; metadata.Setup(p => p.Properties).Returns(() => new[] { prop1Metadata }); // Act string result = DefaultEditorTemplates.ObjectTemplate(html, SpyCallback); // Assert Assert.Equal(expected, result); } [Fact] public void ObjectTemplateAllPropertiesFromEntityObjectAreHidden() { // Arrange HtmlHelper html = MakeHtmlHelper(new MyEntityObject()); // Act string result = DefaultEditorTemplates.ObjectTemplate(html, SpyCallback); // Assert Assert.Equal(String.Empty, result); } private class MyEntityObject : EntityObject { } // StringTemplate [Fact] public void StringTemplateTests() { Assert.Equal( @"", DefaultEditorTemplates.StringTemplate(MakeHtmlHelper("Value"))); Assert.Equal( @"alert('XSS!')</script>"" />", DefaultEditorTemplates.StringTemplate(MakeHtmlHelper(""))); } // PhoneNumberInputTemplate [Fact] public void PhoneNumberInputTemplateTests() { Assert.Equal( @"", DefaultEditorTemplates.PhoneNumberInputTemplate(MakeHtmlHelper("Value"))); Assert.Equal( @"alert('XSS!')</script>"" />", DefaultEditorTemplates.PhoneNumberInputTemplate(MakeHtmlHelper(""))); } // UrlInputTemplate [Fact] public void UrlInputTemplateTests() { Assert.Equal( @"", DefaultEditorTemplates.UrlInputTemplate(MakeHtmlHelper("Value"))); Assert.Equal( @"alert('XSS!')</script>"" />", DefaultEditorTemplates.UrlInputTemplate(MakeHtmlHelper(""))); } // EmailAddressInputTemplate [Fact] public void EmailAddressTemplateTests() { Assert.Equal( @"", DefaultEditorTemplates.EmailAddressInputTemplate(MakeHtmlHelper("Value"))); Assert.Equal( @"alert('XSS!')</script>"" />", DefaultEditorTemplates.EmailAddressInputTemplate(MakeHtmlHelper(""))); } // DateTimeInputTemplate [Fact] public void DateTimeInputTemplateTests() { Assert.Equal( @"", DefaultEditorTemplates.DateTimeInputTemplate(MakeHtmlHelper("Value"))); Assert.Equal( @"alert('XSS!')</script>"" />", DefaultEditorTemplates.DateTimeInputTemplate(MakeHtmlHelper(""))); } // DateInputTemplate [Fact] public void DateInputTemplateTests() { Assert.Equal( @"", DefaultEditorTemplates.DateInputTemplate(MakeHtmlHelper("Value"))); Assert.Equal( @"alert('XSS!')</script>"" />", DefaultEditorTemplates.DateInputTemplate(MakeHtmlHelper(""))); } // TimeInputTemplate [Fact] public void TimeInputTemplateTests() { Assert.Equal( @"", DefaultEditorTemplates.TimeInputTemplate(MakeHtmlHelper("Value"))); Assert.Equal( @"alert('XSS!')</script>"" />", DefaultEditorTemplates.TimeInputTemplate(MakeHtmlHelper(""))); } // NumberInputTemplate [Fact] public void NumberInputTemplateTests() { Assert.Equal( @"", DefaultEditorTemplates.NumberInputTemplate(MakeHtmlHelper("Value"))); Assert.Equal( @"alert('XSS!')</script>"" />", DefaultEditorTemplates.NumberInputTemplate(MakeHtmlHelper(""))); } // Helpers private HtmlHelper MakeHtmlHelper(object model) { return MakeHtmlHelper(model, model); } private HtmlHelper MakeHtmlHelper(object model, object formattedModelValue) { ViewDataDictionary viewData = new ViewDataDictionary(model); viewData.TemplateInfo.HtmlFieldPrefix = "FieldPrefix"; viewData.TemplateInfo.FormattedModelValue = formattedModelValue; viewData.ModelMetadata = new EmptyModelMetadataProvider().GetMetadataForType(() => model, typeof(TModel)); Mock mockHttpContext = new Mock(); mockHttpContext.Setup(o => o.Items).Returns(new Hashtable()); ViewContext viewContext = new ViewContext(new ControllerContext(), new DummyView(), viewData, new TempDataDictionary(), new StringWriter()) { HttpContext = mockHttpContext.Object }; return new HtmlHelper(viewContext, new SimpleViewDataContainer(viewData)); } private class DummyView : IView { public void Render(ViewContext viewContext, TextWriter writer) { throw new NotImplementedException(); } } } }